flyer_json.rb

require 'csv'
csv_file   = File.new('/Users/marketing-imac1/Desktop/tmp.csv')
json_file  = File.open('/Users/marketing-imac1/Desktop/areas.json', 'w')
csv        = CSV.open(csv_file, 'r').to_a
str        = ''
last_index = csv.length - 1
block      = lambda do |row, i|
  closer = i == last_index ? "]" : "],"
  str += '  [' + [('"' + row[0]) + '"', row[1], row[2], row[3]].join(', ') + closer + "\n"
end

csv.each_with_index(&block)
str = "var areas =\n" \
      str \
      '];'
      
File.open(json_file, 'w') { |file| file.puts str }